Lock



Patented Aug. 24, 1926.

e evens WILLIAIM sorrronr, or INN TKA, ILLINOIS. .11. 1. 1) Li ;I 1

Loon,

Application filed May 6, 1925, Serial No. 23,434.

This invention relates primarily to locks of the niulti-b'olt typecommonly used in safe doors, although itis equally applicable to the ordinary'single slidingbolt lock, the

principal objects 'beingto' provide a novel, key-operated lockthe' working parts of WlliCll ma readily bare-arranged to necess'itate a different key to "operate the lock,

and "also loblrwhich will require a plulu r'ality' of turns of key to shift the bolt.

'The invention further resides in a key having' plural-lug "bit, "the lugs of which are interchan eable according "to the relative change inade'in thelockparts. f

rurrherytheinvention resides in the features of construction, and the arrangements antl combinations of parts hereinafter described and claimed, reference being had to the accompanying drawings, wherein- Figure 1 is a reduced showing, in elevation, of the improved lock;

Figure 2 is a view thereof with the cover of the lock casing removed and the bolts de icted in their operative position;

igure. 3 is a similar viewshowing the bolts retracted to their inoperative position;

Figure 4 is an irregular transverse section on line 4-4 of Figure 3;

Figure 5 is a fragmentary View, in eleva tion, illustrating the key acting to arrange the tumblers to permit movement of the lock bolt;

Figure 6 is a similar view depicting the lock bolt in its midway position;

Figure 7 is detailed section on line 7-7 of Fig. 5;

Figure 8 is a fragmental perspective view of the tumbler casing with the several tumblers projecting therefrom;

Figure 9 is a perspective view ofthe key' with the lugs or bits disassembled; and

Figure 10 is a perspective view of the keyengaged portion of the locking bolt.

Referring more in detail to the accompanying drawings, the lock casing 1 has its cover 2 secured thereto, as by fasteners 3. A main bolt 1 is slidably mounted in the casing with its shank 5 extending beneath the lock tumblers and equipped with spaced racks 6 on opposite edges of the shank in longitudinal offset relation. These racks engage pinions 7 journaled in the casing 1, and also in the slots 8 of the shank 5, for driving them and, through the pinions,the

designed to receive the bolt shank 5;. Thetnmblers are backed auxiliary bolts Qwhich have shank-racks 10mes'hing with said pinions, as illustrated; Tlieshanks of the auxiliary bolts are limited in' theirdsliding movement by the pinand slot connections 11 withthe casing, the j ournals torthepinions cooperating withthe end the several tumblers 13 slidably project, i

being limited in their movement by the screw-14m- Eaohtumbler is provided with a slot 15openingthrough one edge thereof and each slot has a-pair of. recesses 1'6 andf17 the lug 18 carried by by springs 19 which urgethem to a normal locking position wherein the slots 15 are out of registry with each other with the exception of the recesses 16 and 17. Thus, the lug 18 can not be moved until the slots 15 are brought into relative registration.

This registering of the tumbler slots is effected by a key comprising a stem or shank 20 having a squared or non-circular sectioned portion 21 designed to receive the hubs of a plurality of tumbler lugs 22 and a bolt-shifting lug 23. The lugs 22 have suitable indicia thereon corresponding to similar marks on the tumblers, as indicated at 24, by which the lugs may be related to their respective tumblers so that the tumblers will be shifted by the key to an extent to effect registry of the tumbler slots. By this provision, the lugs 22 may be removed and rearranged to provide another combination which, of course, will necessitate a corresponding rearrangement of the tumblers. signed to engage the shoulders 25 and 26 of the main locking bolt 4 to shift the latter in successive steps in either direction. The several lugs and 23 are secured on the shank 21 by a nut 27.

In operation, to unlock the door, or other closure, the key is rotated in the direction of the arrows in Figs. 5 and 6. The initial turning movement of the key arranges the tumblers with their slots in registry and also opposite the bolt lug 18, or from the position of Fig. 2 to the position of Fig. 5. Continued turning of the key causes Thelug 23 is deits shank-engaging lug 23 to impinge on the adjacent shoulder 25 and slide the bolt to the position of Fig. 6 when it will move out of engagement with said shoulder and shank, and permitthe tumblers to again drop, and the lug 18 to engage in recess 16. Thus in this midway position, the bolt will still be operative. The turning of the key is continued whereupon the lugs 22 will again register the tumbler slots and position the lug 18 for further movement in the slots, which is accomplished'by the shank-engaging lug 23 acting on shoulder 26 thereby completing the shifting of the bolt to fully unlocked position Where it is secured in recessl? by the tumblers assuming normal position as the key lugs 22 move aWay from the tumblers. A reverse double turning of the key will shoot the bolts to full locked position.

The improved look not only affords many combinations and arrangements of the lugs and tumblers, but it is especially useful in safeguarding against an unauthorized holder of a key gaining admission. Thus, should the key be lost it Will only be necessary to obtain another key and rearrange the lugs and correspondingly rearrange the tumblers.

By this rearrangement the lost key if found by a stranger, will not operate the lock.

What is claimed is:

A look of the character specified comprising a casing, a main locking bolt carried thereby and having a lug and a plurality of notches defining contact Walls for engagement by the main actuating cam or" a key, a housing at right angles to said main locking bolt andhaving a plurality of separate interchangeable tumblers in the form of plates extended across'said main locking bolt and having transverse slots adapted for registration to receive said lug, each plate being provided at opposite sides of the slot therein with pairs of lateral branches to receive the lug of said main locking bolt to hold said bolt in a fixed position, the forward portions of said plates being adjacent the notches in said bolt and adapted for engagement by the cams of a key Whereby the plates may be moved longitudinally for aligning the transverse slots therein.

In testimony whereof I affix my signature.

WILLIAM SCIPION I. 

